CopyOutputRequest must have a working result_callback_ when received over mojo

cc/ipc/copy_output_request_struct_traits.h

Index: cc/ipc/copy_output_request_struct_traits.h
diff --git a/cc/ipc/copy_output_request_struct_traits.h b/cc/ipc/copy_output_request_struct_traits.h
index 0143d012d38fbbefdc412b4e4f2d7347ef75dc97..7bc31687beb999ec2fa2241da1da5029fe94d931 100644
--- a/cc/ipc/copy_output_request_struct_traits.h
+++ b/cc/ipc/copy_output_request_struct_traits.h
@@ -5,7 +5,7 @@
 #ifndef CC_IPC_COPY_OUTPUT_REQUEST_STRUCT_TRAITS_H_
 #define CC_IPC_COPY_OUTPUT_REQUEST_STRUCT_TRAITS_H_
 
-#include "cc/ipc/copy_output_request.mojom-shared.h"
+#include "cc/ipc/copy_output_request.mojom.h"
 #include "cc/ipc/texture_mailbox_struct_traits.h"
 #include "cc/output/copy_output_request.h"
 #include "mojo/common/common_custom_types_struct_traits.h"
@@ -36,6 +36,9 @@ struct StructTraits<cc::mojom::CopyOutputRequestDataView,
     return request->texture_mailbox_;
   }
 
+  static cc::mojom::CopyOutputResultSenderPtr result_sender(
+      const std::unique_ptr<cc::CopyOutputRequest>& request);
+
   static bool Read(cc::mojom::CopyOutputRequestDataView data,
                    std::unique_ptr<cc::CopyOutputRequest>* out_p);
 };